ripristino da cartella backup

[pippoabc]

Salve
ho ripristinato il mio sito dalla cartella backup offerta da aruba, ma ho ricevuto i seguenti errori:

Warning: include(/web/htdocs/www.miosito.it/home/shop/vendor/composer/../psr/container/src/ContainerInterface.php): failed to open stream: No such file or directory in /web/htdocs/www.miosito.it/home/shop/vendor/composer/ClassLoader.php on line 444

Warning: include(/web/htdocs/www.miosito.it/home/shop/vendor/composer/../psr/container/src/ContainerInterface.php): failed to open stream: No such file or directory in /web/htdocs/www.miosito.it/home/shop/vendor/composer/ClassLoader.php on line 444

Warning: include(): Failed opening '/web/htdocs/www.miosito.it/home/shop/vendor/composer/../psr/container/src/ContainerInterface.php' for inclusion (include_path='/web/htdocs/www.miosito.it/home/shop/vendor/pear/pear_exception:/web/htdocs/www.miosito.it/home/shop/vendor/pear/console_getopt:/web/htdocs/www.miosito.it/home/shop/vendor/pear/pear-core-minimal/src:/web/htdocs/www.miosito.it/home/shop/vendor/pear/archive_tar:.:/php7.3/lib/php') in /web/htdocs/www.miosito.it/home/shop/vendor/composer/ClassLoader.php on line 444

Fatal error: Interface 'Psr\Container\ContainerInterface' not found in /web/htdocs/www.miosito.it/home/shop/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/ContainerInterface.php on line 25

posso fare qualcosa per evitare l'installazione da zero?
La mia versione è 1.7.6.7.

Grazie per l'aiuto